[U-Boot] [RFC PATCH] net: rtl8169: allow multiple devices

[Stephen Warren <swarren@wwwdotorg.org>]

On 04/25/2016 11:08 AM, Joe Hershberger wrote:
> Hi Stephen,
>
> On Wed, Apr 20, 2016 at 6:31 PM, Stephen Warren <swarren@wwwdotorg.org> wrote:
>> From: Stephen Warren <swarren@nvidia.com>
>>
>> Currently, if multiple rtl8169 devices exist on the PCI bus, they all
>> get the same name, which prevents the user from selecting which to use
>> via the ethact environment variable. Port the auto-naming code from the
>> e1000 driver to solve this.

... (issues with ethprime/ethact)
>> Equally,
>> simply running e.g. "dhcp zImage" twice in a row doesn't seem to work;
>> perhaps the subsequent attempts perform another lookup by name from ethact
>> rather than just using the same device pointer from before?
>
> I believe it does work in general. Are you saying that it doesn't work
> on your board without this patch?

Ah. The problem is that modifying ethprime after it's been used the 
first time has no effect. So, the following work:

pci enum
setenv ethprime 'RTL8169#0'
dhcp zImage

or:

pci enum
setenv ethprime 'RTL8169#1'
dhcp zImage

but this doesn't:

pci enum
setenv ethprime 'RTL8169#0'
dhcp zImage
# Move Ethernet cable
setenv ethprime 'RTL8169#1'
dhcp zImage

I guess that makes sense given how ethprime is supposed to work, but was 
a bit confusing when I wasn't aware.